Strainer for log-carriage steam-feeds.



No. 769,720. PATENTED SEPT. 13, 1904. F. S. STEVENS.

STRAINER FOR LOG CARRIAGE STEAM FEEDS.

APPLICATION FILED NOV. 10, 1903.

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F233 kes mm 6' M W wzdwm qwwzd UNITED STATES Patented September 13, 1904.

PATENT OFFICE.

STRAINER FOR LOG-CARRIAGE STEAM-FEEDS.

SPECIFICATION forming part of Letters Patent No. 769,720, dated September 13, 1904.

Application filed November 10, 1903. Serial No. 180,557. lNo model.)

To all whom, it may concern.-

Be it known that I, FREDERICK SAMUEL STEVENS, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Strainers for Log-Carriage Steam-Feeds; and I do hereby declare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its especial'object to provide an improved arrangement of stringers or perforated shields in steam-distribution systems involving hand-operated or manuallycontrolled distribution-valves; and to such ends it consists of the novel devices and combinations of devices hereinafter described, and defined in the claim.

As is a well-known fact, the piston movements of the steam-feed of a sawmill log-carriage are controlled by a manually-actuated distribution valve or valves, which valves, unless actuated at the proper times, will cause the log-carriage to run away, tearing out the cylinderheads and frequently doing great damage and causing loss of life. Accidents of this character are frequently caused by loose particles of packing or other solid particles which either drop from the steam-feed chamber or are blown from the boiler and become lodged in the distribution-valve, thus making it impossible to operate the distribution-valve, and consequently causing careless runaways, as above stated. In accordance with my invention 1 place strainers in the steam -pipe connections to the distribution valve or valves that serve to prevent solid particles, such as portions of the pistonpack ing, from reaching the distribution valve or valves.

The invention is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Figure 1 is a perspective view with some parts sectioned and some parts broken away. showing an ordinary log-carriage steam-feed device having my improved strainers applied in the steam-pipe connections thereof. Fig.

2 is a detail, partly in plan and partly in horizontal section, showing one of my improved strainers. Fig. 3 is an end elevation of the said strainer. Fig. 4 is a detail in face elevation showing the perforated disk of the strainer, and Fig. 5 is a section on the line :z' of Fig. 4.

Of the parts of the steam-feed device the numeral 1 indicates the cylinder; numeral 2, the piston; the numeral 3, the steam-supply pipe, having branches 4: leading one to each end of the cylinder, and the numeral 5 indicates as entireties the distribution valves, which are located one in each of the branch pipes 4 and are connected to a controlling-lever 6 by the usual intermediate connections 7.

The numeral 8 indicates the beamwork of a floor, to which the cylinder 1 is anchored, and the numeral 9 indicates a portion of a boiler or other source of steam-supply, from which the steam-pipe 3 leads outward.

My improved strainer in its preferred form is made up of a pair of semispherical heads 10 and an interposed perforated strainer or dividing disk 11. The peripheral of the disk 11 is clamped between the abutting flange portions of the sections 10 with a steam-tight joint by means of short nutted bolts 12. One of these strainers is placed in each branch pipe i, between the cylinder 1 and the corresponding distribution-valve 5, and a third strainer is placed in the supply-pipe 3that is, between the boiler and the said distribution-valve. Vith this arrangement it is evident that any portions of packing or any other solid particles of suiiicient size to clog or interfer with the actions of the distribution-valve cannot reach the said valves either from the cylinder or from the boiler. 'Io adapt the strainers for insertion between sections of the steampipes, the semispherical heads 10 are provided with internally-threaded hubs 13, into which the said pipe-sections may be screwed. The aggregate conducting capacity of the perforations of the strainer-disk 11 should be equal to or greater than the conducting capacity of the steam-pipe in which the strainer is interposed, and to provide for this it is of course necessary that the heads or sections of the strainerbe made of much greater diameter than the diameter of the pipe that leads thereto.

It Will of course be understood that the construction and arrangement above described are capable of modification Within the scope of my invention as herein set forth and claimed.

What I claim, and desire to'secure by Letters Patent of the United States, is as follows:

In a steam-feed device, for log-carriages, or the like, said device having manually-controlled distribution-valves, of strainers inter- IO posed in the steam-supply connections between said distribution-valves and the cylinder, and between said distribution-valves and the boiler connection.

In testimony whereof I affix my signature in presence of tWo Witnesses.

FREDERICK SAMUEL STEVENS.

Witnesses:

J. A. KING, F. A. GRoss. 

